Tool for turning crank-pins, &amp;c.



F. P. BOLLINGER.

TOOL FOR TURNING CRANK PINS, m.

, APPLICATION FILED JUNE 5, I919.

Patented Aug. 9, 1921.

ATTORNE FREDRICK 1 BOLLINGER, 0F NEWARK, NEW JERSEY, assreivon 0E ONE-HALF To -WILFREI) :r. rEeK, or NEWARK, NEW JEiasEY. I r j assaesa.

To all whom it may concern:

Be it known. that L'Fnnnnro P. BOL- LINGER, 'a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented new and'useful Improvements in Tools for Turning Crank-Pins, &c., of which the following is a specification.

The objects of this invention are to secure an improved tool to be applied to the bearings of a crank shaft or the like and turned by hand to true said bearings when they have become rough or worn out of true oylindrical shape, without putting the crank shaft or the like in a lathe or similar turning machine; to provide a construction which shall enable the tool to take work of a maximum range of -diameters, so that it will not be necessary to keep in each shop a tool for every difierent size of'shaft; to utilize in connection with flat bearingsurfaces at an angle to each. other a slot symmetrically disposed on opposite sides of a plane bisecting the angle between said surfaces for gulding a work-engaging member;

to arrange said bearing surfaces at substantially right angles" to each other and in opposite pairs, so that they tangentially env gage different sized shafts at points the same angular distances apart; 'to provide nnproved -means for preventing the member 7 sliding in the said slot from tilting out of parallelismto the work; to thus secure a tool which shall work accurately and efficiently, and to obtain other advantages and results as may be brought out in the following description. Referring to the accompanying drawings, in which like numerals of reference indicate the'same parts throughout'the several views,

' Figure 1 is'a side view'of my improyed tool operating upon a crank pin or the l1ke, partly in central section on line 11, Fig. 2;

' Fig. 2 is an edge view of the tool upon the crank pin or the like, partly broken away to show a certain roller and carrier block therefor;

Fig. 8gisa-perspective view of said roller and carrierblock attached;

Fig. 1 is asection similar to Fig. 1, illustrating a modified form of cutter, and

Fig. 5 is a cross-section of said modification, on line 5-5, Fig. 4:. Inthe specific embodiment of the invenmoor. Eon TURNING CRANK-Ems, 8w."

tion shown in said drawings, 1 and 2 indicate the two parts of the body portion'which are adapted to be clamped together upon opposlte sides of a crank pin 3 or the like by means of bolts 4, 4: extending loosely through one part, as 1, and threaded into thefother part, as 2. Each of these bolts has .a projecting head '5 for turning, and its portion which extends loosely through the body part 1-l1as an annular gr0ove6 to receive a pin 7 extending transversely-through the body part 1 and projecting into said groove 6, as

V Specification of Letters Patent. v P atentd AugQQ, 1921.- Application filed June 5, 1919. Serial No. 301,561. v

shown in Fig. 1, wherebythe bolt 4 is allowed to'turn and yet helcl'against longitudlnal movement. By knocking out the plns 7, 7 obviously thebody part1 canbe removed, for convenience in applying the tool toa crank pin, and at other times rota- I tlon of the screws-willvdraw the body parts 1 and?! together or force. them apart, ac-

cording to the direction of rotation. V

The body part 2 has :atits middle a transmounted rotatably in'a cylindrical seat'which incloses more than half of--'said roller crosssectionally and thus holds" it from escape. Longitudinal movement of the roller is prevented by a pin 11 extending transversely through the block 9 and a'groove 12 in the roller. It will be understood that both block 9 and roller 10 are preferably vexposed jat their, ends, theends of the block being substantially flush with the sidesurfaces of the body part2 while the roller'projectsa little there beyond, as shown in the drawings, for purposes hereinafter referred to.. An adjusting screw 13 works throughthe body part 2 midway between its ends andat its inner end carries theblo'ck 9, so that said block, and thus the roller '10can-be' adjusted toward and away from the crank pin 3. A look nut 14 enables the screw-13 to be secured in place after the roller has been laid", justed, and'I have shown the inner end of said screw rotatably entering a'socket in the block 9 and grooved to receive a transverse pin 15 to preventits withdrawal;

similar construction, having a transverse recess with flaring walls 16, 16 preferably at right angles to each other and the bottom of said recess formed with a slot symmetrically disposed upon opposite sides of a plane bisecting the angle between said walls 16, 16, as at 17, to receive a cutter bar 18 adapted to slide toward and away from the work or crank pin 3 for adjustment. This bar 18 has a long cutting edge 19 at its inner side, and it will be understood that both said bar and cutting ed e extend a little more than the width of the body part 1 so as to project slightly therefrom, as shown in Fig. 2. This projection is equal to the projection of the roller 10, before referred to, and is to enable the tool to work right up to the end wall of a crank pin without the restof the tool striking said end wall. The cutter bar 18 is at its outer side bored and tapped midway of its ends to receive the correspondingly reduced end 20 of a stud 21 which is screwed permanently into said cutting tool. The outer end of this stud 21 is reduced and threaded as at 22 to screw into a correspondingly threaded socket 23 of an adjusting nut 24, said adjusting nut being rotatable in the slideway 25 for the stud 21 and being held against longitudinal motion by a pin 26 transversely through the body part1 and entering an exterior annu-- lar groove 27 in the adjusting nut .24. It will be understood that by turning said adjusting nut 24 the stud 21 maybe moved along its slideway 25to move the cutter toward or away from the crank pinv 3 constituting the work, the said stud 21 and cutter bar 18-remaining in fixed relation to each other. 7

If anything further is found necessary to prevent tilting or rocking of the cutter bar '18, I may provide it at its ends with the same means which is hereinafter described as applied to the block 9 to prevent it from tilting. Another means for preventing tilting is illustrated in Figs. 1 and 5 of the drawing and consists in using a stud 80, reduced and threaded at its outer end as at 32, of larger diameter than the width of the slideway for the cutter bar 18 so that grooves 81 are formed in the side walls of the said slideway to receive the stud 30 no mattor how far inward the cutter is adjusted.

Handles 28, 29 project oppositely from the body parts 1 and 2, by which the tool can be turned, and it will be understood that in use said tool is placed upon the crank pin or similar member to be operated upon and rotated by means of said handles 28, 29, the crank shaft or other member having been put in a vise or suitable clamp to hold it in rigid position. After my improved tool has been applied to the crank pin, the screws 1, 1 are tightened until the beveled surfaces 8, 8 and 16, 16 engage the surface of the work if the latter is longer than the Width of the tool. After a cut has been made in this manner, the screw 18 is tightened a littie to keep the roller 10 against the work and hold the work against the bevels 16, 16, and another cut taken, and this is continued until the crank pin is perfectly cylindrical.

If it should happen that so much must be taken off as to carry the work far enough away from the bevels 8, 8 to cause chattering, it is necessary only to take up on the screws 1, 1 but this does not often happen.

With my improved construction it will be noted that the bearing surfaces 8, 8 and 16, 16, those of each pair being one at right angles to the other, always tangentially engage the -work at points substantially 90 degrees apart, regardless of the diameter of the work, and that the tool, because of the described arrangement of the cutter and block 9 with respect to the said bearing surfaces, is enabled to take work of a maximum range of diameters.

It is important to prevent any tilting or rocking of the block 9, and while various means might be employed for this purpose I have in the drawings shown arblock provided at its opposite ends with lateral flanges 91, 91 which fit into rabbets 92 cut in the side walls of the body part 2 at the opposite ends of the transverse recess therefor. Said block and its flanges fit accurately in the recess and its rabbets, and obviously there can be no endwise tilting or other displacement of the block and its roller 10, therefor.

@bviously detail modifications andchanges may be made in manufacturing my invention without departing from the spirit and scope of theinvention, by those skilled in the art, and l do not wish to be understood as limiting myself except as required by the following claims when construed inthe light of the prior art.

Having thus described the invention, what I claim is:

1. In a tool of the character described, the combination of opposite bodyparts one having a pair of substantially flat'bearing surfaces adapted to tangentially engage an approximately cylindrical piece ofwork, the body part with such bearing surfaces having also a guiding slot between said bearing surfaces symmetrically disposed upon opposite sides of a plane bisecting the angle between the bearing surfaces and said bearing surfaces extending from said slot to the face of the body part, whereby the tool will take work of a maximum range of diameters, an adjustable cutter mounted in said slot to surfaces having also a guiding slot between said bearing surfaces symmetrically disposed upon opposite sides of a plane bisecting the angle between said bearing surfaces and said bearing surfaces extending from said slot to the inner face of the body part, whereby the tool will take work of a maximumv range of diameters and said bearing surfaces always engage the work at points the same angular distances'apart, an adjustable cutter mounted in said slot to engage the work between said bearing surfaces, a bearing surface on the other of said body parts to engage the work, and means for clamping the body parts on the work.

3. In a tool of the character described, the combinationof opposite body parts each having a pair of substantially fiat bearing surfaces arranged at substantially right angles to each other and adapted to tangentially engage an approximately cylindrical piece of work, one of said body parts having also a guiding slot between said bearing surfaces symmetrically disposed upon opposite sides of a plane bisecting the angle between the bearing surfaces, whereby the tool will take work of a-maximum range in diameters and said bearing surfaces always engage any work at points the same angular distance apart, an adjustable cutter arranged in the said slot of one of said body parts to engage the work between the bearing surfaces of said body part, and means for the combination of opposite body parts each having a pair of substantially fiat bearing surfaces arranged at substantially right angles to each other and adapted to tangen-.

tially engage an approximately cylindrical piece of work, each of said body parts having also a guiding slot between its said bearing surfaces symmetrically disposed upon opposite sides of a plane bisecting the angle between the bearing surfaces, whereby the tool will take work of a maximum range in diameters and said bearing surfaces always engage any work at points the same angular distance apart, an adjustable cutting member mounted in the slot of one of said body parts to engage the work between said surfaces, an adjustable bearing member mounted in the slot of the other body part to engage the work between the bearing surfaces on said body part opposite said cutting member, and means for clamping the body parts on the work. V

5. In a tool of the character described, the combination of opposite body parts one respective sides of said body part to prevent tilting of said member in said slot and maintain, the engaging surface of the member parallel to the axis of said work, means for adjusting said member in said slot, and

means for clamping said body parts on the work.

FREDRIOK P. BOLLINGER.

'70 having bearings adapted to tangentially en- 

